Friction-drum.



Patented Mar. I3, |900.'

c. CAMPBELL.

FRICTIUN DRUM.

(Appliqation led Apr. 28, 1898.

(No Model.)

INVENTOR UNITED STATES PATENT OFFICE.

COLIN CAMPBELL, OF NEW'ARK, NEV JERSEY, ASSIGNOR TO JOSEPH S.

MUNDY, OF SAME PLACE.

FRICrloN-DRUM.

SPECIFICATION forming part of Letters Patent No. 645,163, dated March 13, 1900. Application filed April 28, 1898. Serial No. 679,Q56. (No modelo To all whom, t may concern:

Be it known that LCoLiN CAMPBELL, a citizenof the United States,and a resident of Newark, in the county of Essex and State of New Jersey, have invented certain new and useful Improvements in Friction-Drums, of which the following is a specification.

This invention relates to improvements in friction-drums, the object being-to produce such a device in which the friction between of my invention, Figure 1 is `a top plan view,

partly in section, of -a friction-drum embodying my invention. Fig. 2 is a section taken on the line 2 2 of Fig. l. Fig. 3 is a section taken on the line 3 3 of Fig. l, and Fig. 4c illustrates in detail the form of means for engaging the drum with the friction device which I prefer to employ.

In the drawings, A is the drum, loosely mounted on the constantly-rotating shaft B, which rotates in the journals C and D. The 'shaft B carries with it the gear-wheel E,which meshes with the pinion F, mounted on shaft G, which is rotated by an engine, motor, or other source of power. The gear E is provided with the friction-cone H, which engages with the drum A.

To the side of the journal C is secureda claw or bracket I, through which extends the operating-shaft J. The bracket I is formed on its inner face with a cam I', and the shaft J carries a cooperating cam J The end of the shaftJ bears against the rear of the twoarmed thrust-pin L, which passes through the journal O on either side of the shaft B, and the ends thereof engage a collar M, which is free to move horizontally onl the shaft B, as shown. To the operating-shaft is fixed a suit- In the drums now in use' it fre-- able operatingehandle K, by means of which the shaft J is rotated. Uponrotation of the shaft the cams I and J cooperate to force the able collar N, which rotates therewith when the drum is in engagement withv the friction device. Between the collars M and N are located aseries of hardened-steel balls O, which are confined in a circular runway formed on the adjacent sides of said collars M and N, as

collars have been in contact with each other and the friction resulting when the drum was in operation was often sufficient to .cause an intense heating of the collars.

It has been found in practice that oil or other lubricants' shown in Figs. l and 3. Heretofore when these the parts. A spring P is preferably provided,

as shown, to throw the drum out of engage' ment with the friction device when the handlever K is moved -to release the drum.

Although I prefer to use the cooperating cams I and J as the operating means in my device, I may employ the means 'shown in Fig. 4. In this figure the bracket I is interiorly screw-threaded, and the operating-shaft J 2 is screw-threaded to engage the screw-threads of the bracket. The handle K is fixed to the outer end of the shaft J'2 andis operated in the same manner as before described.

What I claim as new, and desire to secure bearing against the rear of said pin for moving the latter to engage the Vdrum with the friction device.

2. The combination in a hoisting-machine of a shaft, a friction-drum loosely mounted on said shaft, a two-armed thrust-pin, a col IOO lar adapted to be moved horizontally on the shaft by said pin, an operating means bearing against the rear of said pin for moving -it to engage the drum with the friction de- Vice and a series of balls located between said collar and drum, substantially as described. n Y

3. The combination in a hoisting-machine of a bearing, a shaft, a friction-drum loosely 'mounted on said shaft, a two-armed thrustpin passing through said bearing, a bracket secured to said bearing and straddling said pin, an operating-lever, a cam moved by said lever, a cam formed upon the bearing of said lever, said cams operating to force the thrustpin forwardly to eng-age the drum with the friction device, and a series of balls located between said collar and the drum, substantially as described.

COLINl CAMPBELL.

Witnesses:

RICHARD M. BARNETT, PHILIr E. MEEKER. 

